The condition is that no dust particles resting on the display, and that the protective film is well aligned at the beginning.
The carrier film is pulled off at an acute angle to the rear and the protective film rests against sucking. Emergence of air chambers, you can simply lift the sheet back and republish. (It adheres more, alas that she sticks)
Ausmassieren the bubbles with the debit card - is not necessary in this new film